The endosperm is formed by a fusion between the and '

The endosperm is formed by a fusion between the sperm nucleus and two haploid polar nuclei.

Endosperm is a tissue surrounding the embryo of flowering plant seeds, which provides nutrition to the developing embryo. Endosperm formation involves double fertilization. There is fertilization of one sperm nucleus to produce a zygote, while the other sperm nucleus fuses with two haploid polar nuclei to form an endosperm cell. Endosperm is triploid because three cells are fused together.

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what do the different brain waves do?

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brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.